The overall standings remained unchanged at the top with Thomas leading defending champion Froome by one minute 39 seconds and Dutchman Tom Dumoulin by 1:50.
World champion Tom Boonen stepped off his bike 59 km from the finish of the 15th stage over 187 km from Gap to l'Alpe d'Huez.
Portugal's Rui Costa took his second win of this year's Tour de France with a solo victory at Le Grand Bornand on Friday.
Tired of the doping scandals, Tour de France organisers have designed a balanced route for the 95th edition.
Geraint Thomas tightened Team Sky's grip on the Tour de France when he handed the British outfit their sixth title in seven years on Sunday and there is no sign that their domination will end anytime soon.
Frank Schleck of Luxembourg powered away with two kilometres left to claim the 15th stage of the Tour de France.
Lance Armstrong retained the overall leader's yellow jersey when he came home safely in the main pack.
Hold your breath as Rediff.com brings to you some of the picturesque places that the cyclists race through at the Tour.
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The Briton cracked with less than five kilometres to go on the second trip up the mountain's 21 hairpin bends but sent team mate Richie Porte to fetch some food and the Australian nursed Froome to the finish 3:18 behind Riblon, who became the first Frenchman to win a stage in this year's race.
Chris Froome has one more mountainous hurdle to overcome to claim a second Tour de France title after Friday's 19th stage in which had 30 seconds chopped off his lead as Vincenzo Nibali claimed a controversial victory.
This year's Tour de France had been advertised as an exciting battle royale between four great riders yet it panned out as an underwhelming contest as Chris Froome's rivals failed to live up to expectations.
Briton Chris Froome won his second Tour de France title in three years on Sunday to enhance his growing reputation as a grand tour specialist.
Chris Froome is poised to win a second Tour de France title after being forced to hang on desperately as Colombian Nairo Quintana attacked relentlessly in Saturday's penultimate stage up the iconic Alpe d'Huez.
Alberto Contador showed he was prepared to risk everything to win the Tour de France on Tuesday, crashing on the final descent as he tried to attack overall leader Chris Froome.